Aw, don't be too impressed. It's basically guesswork based on when the HK Orange was announced, the details of the specs and the wording of them, and what "identical" servos were available anywhere at the time. I made a guess that HK had put in a big OEM order to PZ but specified Orange to differentiate their version since they had gone orange mad with servos at the time.

It could all be pure rubbish - and unless someone from the inside lets on we will probably never know. Trouble with the forums is that people claim to have "inside" knowledge when they know less than my guesswork sometimes. [QUOTE=Cheesehead;19734112]

i was looking for a good substitute for my Walkera Genius and found this thread...the stock servo is near $17.00 each which could get pricey after a while...the weight of the stock servo is right at 2.4 G so i thinking the HK-5320 might be the perfect solution as a replacement plus could save some weight as well...

A couple of weekends ago I had a go at making one light as I could get it, below are the results. I meant to post it back then but have been busy and forgot until tonight.

I spent about two hours on it, cleaning off the excess solder, sanding and grinding and making the garolite adapter ring for the motor. On the pinion gear I used a bit of teflon heatshrink to make shaft fit, since the shicoh shaft is smaller.(.023" compared to .027") I sanded down the electronic parts, and thinned the orange casing by scraping at right angles with a razor blade. (to about half)

Was it worth the effort? Well, the F7 3.2mm 30 ohm shicoh is slower and weaker than the 11 ohm 4mm stock motor, you can really see the difference side by side. (I should have made a vid, sorry) Feels like about half the torque than stock- speed is closer to the same though. If I do it again I'll likely use the stock motor, as it is only about 0.12g heavier.

I'm adding some photos of the chips with numbers showing, and of the gearbox and other parts. I bought a few extra of these servos just for the modulus 01 gears, needing them on another project. Ill be flying them in stock form too in the future. I like everything but that bright orange color.

Worth noting too is the very messy gob soldering at the factory- the wires are almost shorted at the board on all three servos I'd had apart. The insulation is melted in spots, and the way it's crammed into the plastic case rubs the wires against each other and the board. If you have one that quits working look there first....

Thanks.... I didn't think to weigh the pot/motor/pcb individually...do recall the power 3 wire input and plug was .3 grams, I cut them off at the case to start. I didn't weigh it again until I was finished.

On the gears, it is a mixture of mod 1 and mod 2 size gears. I think didel just sells mod 2 and bigger. The mod 1's are really tiny. What I was after for my other project was the 9t pinion and a 28t spur that's in there, for my submicro brushless motor project.

It might be possible to swap the steel shafts out (with cf or aluminum tube?) and get some more weight off. A bit more plastic could be trimmed too.

I think it's just the Leichty ~0.7g servos, which cost about seventeen times as much.

On a related note, it's theoretically possible to add a feedback loop to one of those DelTang 0.4g actuator receivers. Swap the actuator for a motor and add one of the hall effect sensors used for the milligram brushless setups, and you have yourself a very tiny servo driver.

Incidentally, I bet the above servo would only weigh about 0.7g without the PCB.